Salt shortages will limit gritting, making driving conditions difficult.

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Among the recommendations were calls to limit added sugar to ten per cent of the total calorie intake and to limit daily salt intake to five grams per day.

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It follows the exceptionally harsh conditions experienced in the past two winters, when stocks of road salt were stretched to the limit.

BBC: Snow on roads in the Eden Valley

This is a difference of 1.2g salt a day, a fifth of the maximum 6g limit for the whole day.

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The mayor has also launched initiatives to limit the intake of trans-fats and salt, moves that generated criticism at the time.

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